bx
0
1
bx
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1
bx
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3
bx
0
1
bx
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2
bx
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2
bx
0
1
bx
0
1
bx
0
2
bx
0
1
bx
0
1
bx
1
2
bx
0
1
bx
0
1
bx
0
1
bx
0
1
bx
0
1
bx
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1
bx
0
1
bx
0
1
bx
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1
bx
0
1